Head spacer gauge for rifles



N. c.- z AfNQa-.ilo HEADJ SPACER GAUGE FOR RIFLES Apg-H 4, 1950 Ffiled Jan,.-31, 1947 Patented pr. 4, hQSl ,My invention relates to'measuring tools and more" particularly to gauges for measuring the headspace inries. l

The "object of my invention is to provide a gaugef`c'onsisting of ameasuring rod removably fastened to a base vshaped like a vcartridge and adapted to extend'through the bore of a rifle barrel.y

.Another object of my invention isto provide a gauge of the character indicated' above, the measuring rod whereof is adapted to serve asr an anvil of a micrometer removably attached to the rifle barrel. y n *y Y Other objectsy of mylinvention may appear in theffollowing specification.' describing my inventionwith reference to'th'eaccompanying draw# y ings illustrating a preferred Vembodiment of my invention.

It is, however, to beunderstood, that my in;-l lvention is not to be limited or restricted to the exact construction and lcombination, of parts described in the specification and vshown 1in .the drawings, but that such` changes and modi'iical tions can be made, whichfall in the scope of the claims appended hereto. v

Inl the drawings: I Figure 1 is" a longitudinal ksectional view through a rie barrel, .to which a head lspace gauge accordingto my invention is attached. 'A

vrFigure 2 is a sectional View taken online in (Figure l. .V Figure 3 is a fragmentary elevational sidefview, partly shown in section, ofjth'e assembled mease uring rod of the gauge according tomy inven-` tion, and f Q Figure'i is asectional viewtaken'onlin'e 4-4 'in Figure 1. l; Referring now in detaill'to the drawings, Ithe head lspace. gauge forming the subject matter of myinve'ntion, comprises a measuring .rod I0 consisting of a base I I shaped like a rifle cartridge.

and fitting closely into the firing chamberl I2 of. a rifle, and a round rod I3 threadedly connected with the forward reduced portion lI4 of the baseII. n .y

.Thev base II and the rod I3 arefassembled by screwing them tightly togetherand this assembly is inserted in Ythe rifle barrel I5 from thelrearlby removing the rifieboltSL` r n e n After the assembly hasfvbeeninserted the bolt I is replaced again. .f1 -1 251A, sleeve I6 lfits slidably on-the rod I3v and lits tightly into the muzzle of the barrel I5. j A diametrically extending holef4 |11 is provided inthe rod I3, so that this hole -,I'I will be located S PATENT* OFFICE 2,502,613'V 1 l.1an/in SPACER GAUGE-Foa RiFLEs Nicholas C. Zanolo, Durango, Colo. l "Appuandn January 31, 19417, seria1No..725,444 7 claims.v (C1. 33 174) 2 at a distancefin front of the sleeve I6, when this sleeve is positioned inthe rifle muzzle, yand the assembled'measuring rod I0 is arranged in the rifle, so that thek base II is in its foremost possible position. b:

A helical spring I8 is arranged, so that it surf' rounds the rod I3 and abutsrthe forward endl of the sleeve I5. A pin I9 is inserted in the hole I1 and the spring I8 engages this pin and urges the measuring rod I 0 forwardly into its foremost possibleposition.

Any adjusting bar 2l! isrlocated slidably ina sleeve 2l formed on the lower portion of a barrel clamp 2,2, which is rslotted longitudinally as .inT

dicated 23 to enable theclamp to slide over the y sight l2li on the rifle barrel. The upper wing ends 25 ofthe clamp are adapted to be forced together by means of a bolt 2B and a wing nut 21 on said bolt to secure the clamp in position o n the rifle barrel I5. f

A set screw 23 in the wallof the sleeve 2| is adapted toengage the adjusting bar 20 in ad.- justed position.

`On the forward end of this adjusting bar a micrometerg29 of any'well known make andconstruction is secured or formed.

The anvil of this micrometery is removed and the forward end of the rod I3 extends through the hole in the micrometer usually accommodating the foot pin of the anvil.

To measure the headwpiece of therifle, the micrometer screw 30 is set totouch the forward end of the rod I3. Thesettingtof the micrometer is noted. Then the rod I3 is forced rearwardly until the yrear surface of the base II contacts the `bolt 3j The micrometer 30 is reset totouch the forward 4end of the rod I3 in its new position and this setting of the'micrometer is read and deducted from the first reading. The result is equal to the head space of the rifle.

Having described my invention I claim as new and desire to secure by Letters Patent:

1, A gauge for measuring the head space of a rifle, comprising a base shaped to simulate a rifle cartridge and being disposable in the firing chamber ofthe rifle, and a rod elongated to eX- tend through thegbarrel ofthe rifle and voutwardly of the muzzle'thereof, including means for removably securing said rod at its inner end to said base, said rod having a spring engaging meansdisposed forwardly of the muzzle of the rifle Whenjthelrod is inserted in the barrel thereof and is' attached to said base, and a spring having an endv engaging said spring means for main? taining said base in full forward simulated firing position, including means :for providing an opposing force engagement for the other end of said spring, said spring being stressable to permit said rod to be thrust rearward manually the full extent determined by the head space to be measured.

2. A gauge for measuring the head space of a rie, comprising a base shaped to simulate a rifle cartridge :and being disposable in the iiring chamber of the rifle, and a rod elongated to yextend through the barrel of the rifle and outwardly of the muzzle thereof, including means for removably securing said rod at its inner end to said base, said rod having a spring engaging means disposed forwardly of the Amuzzle of the rifle when the rod is inserted in the barrel thereof and is attached to said base, anda spring having an end engaging said spring engaging means for maintaining .-sad base in full forward simulated ring position, including means for -providing an opposing force engagement for the other end of said spring, said spring being stresslable to permit said rodto be thrust Vrearward manually the full extent determined by the .head space to be measured, including means disposed adjacent the outward end of said `rod-for measuring the travel thereof between full lforward position vto full rearward'position as determined bysaid head space.

3. A gauge Afor measuring the `head space of a rie, comprising a base shaped to `simulate a riiie cartridge and being disposable in the firing chamber of the rifle, and a rod elongated to extend through the barrel of the l-riiieand outwardly of the muzzle thereof, including means for removably securing said rod Aat its inner end to said base, said rod having a spring engaging means disposed forwardly of the lmuzzle of the riiie when the rod is -inserted'inthe'barrel thereof and is attached to said base, anda spring lhaving an end engaging said spring engaging means for maintaining said base in full forward simulated firing position, including means for providing an opposing force engagement for the other end of said spring, said spring being stressable to permit said rod to be thrust rearward manually the full extent determined by the head space to be measured, including support means disposable at the muzzle end of said rifle, and a micrometer head carried -by said support means, said micrometer head having areciprocal element engageable with the outer end of said rod for measuring the length .of said travel.

l4. A gauge for measuring the head space of a rie, comprising a :base shaped to simulate a rifle cartridge and being disposable in the .ring chamber of the riiie, .and la rod elongated to extend through the barrel of the rie and outwardly of the muzzle thereof, including means for removably securing said rod at its inner .end tol said base, said rod having a spring engaging means disposed-forwardly 4of the muzzle of the rifle when the rod is inserted in the barrel thereof and is attached to said base, and a spring having an endv engaging said spring engaging means for maintaining said base in'full forward simulated firing position, including means for providing an opposing force engagement for the other end of said spring, said spring being stressable to permit said rod to be thrust rearward manually, the full extent determined'by the head space to be measured, wherein said rod and base are threadedly connected to permit attachment or lseparation thereof when the base is in ring position.

5. A gauge for measuring the head space of a rie, comprising a base shaped to simulate a rie cartridge and being disposable in the firing chamber of the rifle, and a rod elongated to extend through the barrel of the rifle and outwardly of the muzzle thereof, including means for removably securing said rod at its inner end to said base, said rod having a spring engaging means disposed forwardly of the `muzzle ofA the rifle when the rod is inserted in the ibarrel .thereof and is attached to said base, and a spring having an `end engaging said spring engaging means for maintaining said base in full forward simulated firing position, including means for providing an opposing force .engagement for the other end of said spring, said spring being stressable to permit said rod to be -thrust rearward manually, the full extent determined by the head space to be measured, including support means disposable at the muzzle end of said rifle, and a ,micrometer head carried by said support means, said Vmicrometer head having a reciprocal element engageable with the outer 'end of said rod for measuring the length lof said'travel, said reciprocal element being engageable with the outer extremity of said vrod at either limit of `travel thereof. y

6. A gauge for measuring the head space of a rie, comprising a base shaped to simulate a rifle cartridge and being disposable in the firing chamber of the rifle, and a rod elongated to eirtend through thebarrel of the rifle and outwardly of the muzzle thereof, including means `for `removably securing said rod at its 'inner end to said base, said rod having a spring engaging means disposed forwardly of the muzzle of lthe rifle when the rod 'is inserted inthe barrel thereof and attached to said base, and a spring having an end engaging said spring engaging vmeans for maintaining said base in full vforward simulated firing position, including means `for providing 'an opposing force engagement for the other end of saidspring, said spring being stressable to permit said rod to be thrust rear-ward manually, the full extent determined by the head space to be measured, including means disposed adjacent to the outward Vend .of said rod for measuring the travel :thereof between full forward position Ato fullrearward position as .determined by said head space, said measuring meansbeing carried by a supportmeans and disposed adjacent the 'end of said rod',said support means including a clamp adapted to be secured to vsaid rifle barrel, `and a bar slidably carried by lsaid clamp, and -mean's for iixedly securing said bar and clamp in Aadjustedpositionrelative the outer extremity of said rod.

, `'7. A gauge formeasuring the head space of a rifle, comprising a base shaped to simulate. a 4rifle cartridge and being disposable in the rin-g Achamber of the riiie,A and a rod elongated to extend through the barrel of the rifle and outwardly vof' the muzzle thereof, including means for yremovably securing said rod -at its inner end to said base, said rod having aspring engaging means disposed forwardly'of the muzzle of the rifle when the rod is inserted in the barrel thereof and 'attached to said base, anda spring having one-end engaging said spring engaging Imeans for main-- taining said base in full lforward simulated firing position, including means forproviding an opposing force engagement for 'the other end oi said spring, said spring bei-ng stressable to permit said rod to be thrustrearward manually the full extent determined by the head space tolbe meas- REFERENCES CITED l 'The following references'are of record in the le of this patent:

Number 6 f UNITED STATES PATENT Name Date Houghton July 3, 1906 Eickho Aug. 31, 1920 Wirt Apr. 1, 1924 Svoboda r Oct. 1, 1940 

